EP0124661B1 - Verankerung für ein Drahtseil - Google Patents

Verankerung für ein Drahtseil Download PDF

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Publication number
EP0124661B1
EP0124661B1 EP83302480A EP83302480A EP0124661B1 EP 0124661 B1 EP0124661 B1 EP 0124661B1 EP 83302480 A EP83302480 A EP 83302480A EP 83302480 A EP83302480 A EP 83302480A EP 0124661 B1 EP0124661 B1 EP 0124661B1
Authority
EP
European Patent Office
Prior art keywords
anchoring
anchorage
wire strand
enlarged
wire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83302480A
Other languages
English (en)
French (fr)
Other versions
EP0124661A1 (de
Inventor
Kurauchi Makoto
Kobayashi Takeshi
Izumi Masakazu
Aota Jiro
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobelco Wire Co Ltd
Original Assignee
Shinko Wire Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shinko Wire Co Ltd filed Critical Shinko Wire Co Ltd
Priority to DE8383302480T priority Critical patent/DE3365261D1/de
Priority to EP83302480A priority patent/EP0124661B1/de
Publication of EP0124661A1 publication Critical patent/EP0124661A1/de
Application granted granted Critical
Publication of EP0124661B1 publication Critical patent/EP0124661B1/de
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E04C5/125—Anchoring devices the tensile members are profiled to ensure the anchorage, e.g. when provided with screw-thread, bulges, corrugations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes
    • F16G11/04—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps
    • F16G11/044—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord
    • F16G11/048—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes with wedging action, e.g. friction clamps friction clamps deforming the cable, wire, rope or cord by moving a surface into the cable

Definitions

  • the present invention relates to an anchorage for a steel wire strand for prestressed concrete (hereinafter referred to as a PC wire strand) suitable for prestressed concrete members or members of a stray cable, wherein an anchoring means is used in an embedded state.
  • a PC wire strand for prestressed concrete
  • an anchoring means is used in an embedded state.
  • a steel wire or bar as a steel material for prestressed concrete (hereinafter referred to as PC steel material), an end portion of which is subjected to heading at a warm region (100-500°C) or cold region to form an enlarged anchor portion permitting an embedded use of the steel wire or bar.
  • PC steel material a steel material for prestressed concrete
  • the recent tendency to an enhancement of strength of the aforementioned pile or the like has given rise to an increasing demand for a PC steel material of larger diameter and of higher strength.
  • PC wires for prestressed concrete encounters a limit in the enlargement of their diameter and enhancement of their strength
  • PC steel bars also encounter a limit in the enhancement of their strength.
  • PC wire strands can easily be increased in diameter and strengthened and are superior as regards economy, so their application to the foregoing pile or the like is now in demand.
  • no anchoring means for an end portion of PC wire strands has yet been developed which is inexpensive and compact.
  • PC wire strands are also anchored by means of the combination of forming the end portion of the PC wire strand into a enlarged head and clamping the adjacent portion of the PC wire strand by wedges, as shown in US-A-3,820,832.
  • anchoring means the tension or the stressing force of the PC wire strand is taken only by the wedge anchor and the enlarged head of PC wire strand assists in transmitting the said force to the wedges.
  • Such an anchor fitting is therefore large and expensive for embedded use.
  • Another function of the enlarged head of the PC wire strand in this invention is prevention of undesired slip of the strand in the wedges and ejection of the wedges from the anchor sleeve by jerky movements.
  • the present invention aims to provide an anchorage for PC wire strands which has sufficient strength to match the breaking strength ot those strands and which is small in size, suitable for embedded use and superior in economy.
  • an anchor portion comprising a combination of an anchoring member and an enlarged head portion is provided on a PC wire strand and about two-thirds of the breaking force is taken by the anchoring member and the remainder by the enlarged head portion, then the anchoring member can be shortened to from one third to one half while achieving 100% anchoring efficiency.
  • an anchorage for a wire strand for prestressed concrete comprising an enlarged head portion formed by heading a terminal end of a wire strand, and an anchoring member held in pressure contact with a portion of said wire strand in a position near said terminal end and having a side end held in close contact with said enlarged head portion, said anchoring member being so formed as to have a length corresponding to from one third to one half of the length required for anchoring said wire strand by said anchoring member alone.
  • FIG. 2 there is shown an embodiment of the anchorage of the present invention, in which the reference numeral 10 denotes a PC wire strand, numeral 12 denotes an enlarged head portion formed by heading, and numeral 14 denotes a compression grip (anchor fitting) held in pressure contact with the PC wire strand 10.
  • the compression grip as referred to herein comprises a sleeve for pressure contact with the PC wire strand 10 to form an anchor portion.
  • the compression grip 14 includes a sleeve 16 and a wire coil 18 of a triangular cross section serving as a friction enhancing materiat.
  • the triangular wire coil 18 is interposed between the PC wire strand 10 and the sleeve 16, and in this state the sleeve 16 is brought into pressure contact with the PC wire strand 10 to form an integral body.
  • the friction enhancing material is not limited to the above triangular wire coil 18, and any other suitable friction enhancing material may be used, for example carborundum, or alternatively the PC wire strand 10 itself may be endowed with a friction enhancing action by a slight threading or other means.
  • the length of the compression grip 14 is set at one half to one third of the length required for anchoring with the compression grip alone.
  • the enlarged head portion 12 is brought into a close contact with a side end of the compression grip 14 to form a terminal end of the PC wire strand 10.
  • the numeral 20 denotes a bearing plate
  • numeral 22 denotes an anchoring hole formed in the bearing plate
  • numeral 23 is an enlarged space formed in the bearing plate.
  • FIG. 3 This shows a state before pressure bonding of the compression grip 14 and before heading, in which the PC wire strand 10 has already been inserted through the anchoring hole 22 of the bearing plate 20.
  • a friction enhancing material such as the triangular wire coil 18 and the sleeve 16, and then the sleeve 16 is brought into pressure contact with the PC wire strand 10 as indicated by arrow "A" by compressing, swaging or other suitable means.
  • the compressing of the sleeve 16 may be done by a chucking die 24 of a heading machine for the formation of an enlarged head portion, whereby it is possible to let the above die fulfil both compressing and chucking functions at the same time.
  • heading is carried out on the end portion of the PC wire strand 10 by means of a heading die 26 of the heading machine to form the enlarged head portion 12.
  • an anchor portion is obtained wherein the enlarged head portion 12 and the compression grip 14 are in close contact and integral with each other.
  • PC wire strand 10 is tensioned to the required load by a jack or other tensioning machines and anchored at the bearing plate 20.
  • Conventional cold heading can be used as the method of forming the end portion of PC wire strand into an enlarged head. However, it is preferred to form at a temperature between 100°C and 900°C, more preferably between 500°C and 900°C. In this case, the PC wire strand is heated by passing an electric current between the chucking die 24 and the heading die 26. Other methods may also be used. According to our experiments the shape of the enlarged head formed at a temperature between 500°C and 900°C is satisfactory. If ordinary cold heading is practised, satisfactory forming of the enlarged head cannot be achieved due to the fact that wires forming PC wire strand have stiffness and lie with a certain twist angle against the direction of heading, and so each wire is scattered away when it is pressed by the heading die 26.
  • the end of PC wire strand 10 it is preferable 'to heat the end of PC wire strand 10 to a temperature between 500°C and 900°C to ease the resistance to deformation as much as possible, and also to make the shape of the recess 28 of the heading die 26 a truncated cone as shown in FIG. 3 and to make the diameter d of the bottom of the recess 28 one half to three quarters of the diameter of the PC wire strand, thereby binding each wire at the recess 28.
  • the bottom of the recess 28 of the heading die 26 may be shaped cylindrically with its diameter d' kept about the same as that of the PC wire strand 10, as shown in FIG. 4.
  • the length of the compression grip 14 is set at one half to one third of the length required for anchoring with the compression grip 14 alone, and this numerical limitation is based on a fact obtained from the following experimental data.
  • the anchoring efficiency of the enlarged head portion (i.e. the ratio of anchoring strength to the breaking strength of the PC wire strand) is from about 40% to about 60%. Therefore, in order to allow both the compression grip 14 and the enlarged head portion 12 to take part of the breaking force, it is preferable, when unstability in the above-mentioned range of the anchoring efficiency of the enlarged head portion 12 is taken into account for about two thirds of the breaking force to be taken by the compression grip 14 and the remainder by the enlarged head portion 12.
  • the relationship between the sleeve length of the compression grip 14 and the breaking load is as shown in the graph of FIG. 5.
  • This graph shows the results of an anchoring efficiency test for a compression grip 14 using the aforementioned triangular coil 18 as a friction enhancing material, in which a PC wire strand 12.7 mm in diameter was used.
  • the mark P in this graph indicates a specified breaking load (18,700 kg).
  • Reference to this graph clearly shows that if the specified breaking force is taken by the compression grip 14 alone, a sleeve length of 50 to 60 mm is required, whereas if about two thirds of the specified breaking load is taken by the compression grip 14 according to the present invention, the sleeve length becomes about 20 mm, that is, the sleeve length is shortened nearly to one third as compared with the case of the compression grip 14 alone.
  • the outer circumferential face of the sleeve 16 and the corresponding inner circumferential face 30 of an enlarged space 23 adjacent to an anchoring hole 22 can be tapered as shown in FIG. 6.
  • the load added to an anchorage by tensioning the PC wire strand is borne by the above-mentioned enlarged head 12 and the compression grip 14.
  • the compression grip 14 is set adjacent to the anchoring hole 22 in the bearing plate 20 with the tapered surface 30 of the compression grip 14 in contact with the corresponding tapered surface 32 of the enlarged space 23 in the bearing plate 20, thereby applying a tightening force to the PC wire strand 10 by wedge action at the time of tensioning and increasing the anchoring efficiency.
  • Our experiments showed that the suitable angles of the above-mentioned surfaces 30 and 32 were between 5° and 15°.
  • the compression grip 14 tends to slip out from the anchoring hole 22 of the bearing plate 20 and if the angles are larger than 15° enough tightening force for PC wire strand 10 will not be provided.
  • the longitudinal position of the end 34 of the enlarged space 23 can be determined experimentally so that the desired tensioning force may be provided.
  • the length of compression grip 14 required to give enough anchoring efficiency is remarkably shortened compared with that of the prior art as shown in FIG. 1 and, even compared with that of FIG. 2, is shortened by the amount equivalent to the tightening force gained by wedge action.
  • this method has the advantages of the compression grip 14 and the enlarged head 12 being encased in the enlarged space 23 of the bearing plate 20 to be suited for embedding, and the thickness T of the bearing plate being made less than the thickness T' of the structure shown in FIG. 2.
  • one end surface of the sleeve 16 is required to have the receiving area for the load, and so a sleeve of greater thickness is needed.
  • FIG. 2 one end surface of the sleeve 16 is required to have the receiving area for the load, and so a sleeve of greater thickness is needed.
  • the sleeve is required to have only sufficient thickness to make the outer circumference surface 32 tapered and a sleeve of lesser thickness is preferable in order to transmit the tightening force gained by wedge action to the PC wire strand 10. Therefore, as the whole anchoring portions are reduced in size including the above mentioned enlarged space 23 in the bearing plate 20, the existence of weak portions in the bearing plate 20 is also avoided.
  • Table 1 below shows the sizes of anchorages needed to give the required anchoring strength, in relation to the embodiments of FIGS. 2 and 6 and the prior art as shown in FIG. 1, that is, the total lengths of anchorages L o , L,, L 2 , the diameters of the sleeves Do, D" D 2 , and the lengths of the sleeves in the present invention 1 1 , 1 2 and in the prior art L o for PC wire strands of 9.3 mm and 12.7 mm in diameter.
  • Total lengths of anchorages mean, in relation to the prior art, the length of the sleeve only, and in relation to the present invention, mean the lengths of the enlarged heads 12 plus those of the sleeves L, or L 2 .
  • the length L o of the sleeve 16 needs to be three to four fimes the diameter of PC wire strand
  • the lengths of the sleeves 1, and 1 2 are shortened to from one (1) to one and a half (1.5) times the diameters of the PC wire strands and the total lengths of the anchorages L, and L 2 including the enlarged heads are also reduced to about twice the diameters of the PC wire strands.
  • Anchoring efficiencies are shown by the ratios of the breaking strengths of PC wire strands in each case to the specified breaking strength as mentioned above. The test results show that anchoring efficiencies are about 60% in the case of the enlarged head only, and about 100% and 105% respectively in the cases of FIGS. 2 and 6.
  • FIGS. 7 and 8 show an embodiment where a plurality of anchorages according to this invention as shown in FIG. 2 are applied to a prestressed concrete pile.
  • Numeral 36 denotes spirally shaped reinforcing wire
  • numeral 38 a reinforcing band
  • numeral 40 a body of a prestressed concrete pile.
  • a bearing plate 20 compresses a plurality of anchoring holes with enlarged spaces adjacent to them forming a perforated bearing plate, and each enlarged space adjacent to the anchoring hole is adapted to receive the corresponding end of PC wire strands with enlarged heads and anchoring members.
  • FIGS. 9 and 10 show another embodiment where a plurality of anchorages according to this invention as shown in FIG. 6 are applied to a multi-strand cable.
  • Numeral 42 denotes a threaded portion for coupling
  • numeral 44 a bearing plate
  • numeral 46 a receiving concrete structure.
  • a bearing plate 20 comprises a plurality of anchoring holes with the enlarged space adjacent to them forming a perforated bearing plate, and the inner circumferential surface of the said enlarged space is tapered so as to receive the corresponding tapered sleeve.
  • the breaking force is taken both by the compression grip (anchoring member) and by the enlarged head portion, and the length of the compression grip is shortened to about one third to one half as compared with the case where anchoring is effected with the compression grip alone, so that a less expensive and smaller-sized anchoring portion is obtainable while achieving 100% anchoring efficiency.
  • this anchoring structure moreover, it becomes possible to use PC wire strands in place of conventional PC wire or PC steel bar for post-tensioning prestressed concrete structures of an industrially produced prestressed concrete member wherein the anchor portion is used in an embedded state. As a result, various effects are obtained.
  • the number of PC wires used can be decreased, so that the time and labour required for cutting, wiring and like operations can be greatly reduced, and working efficiency thereby improved.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)

Claims (10)

1. Verankerung für ein Drahtseil (10) für Spannbeton mit einem vergrößerten Kopfabschnitt (12), der durch Kopfbildung an einem Ende eines Drahtseils gebildet ist, sowie einem Verankerungselement (14), das in Druckkontakt mit einem Abschnitt des Drahtseils (10) in einer Position im Bereich des Endes gehalten wird und mit einem Seitenende in dichtem Kontakt mit dem vergrößerten Kopfabschnitt (12) gehalten wird, dadurch gekennzeichnet, daß das Verankerungselement (14) derart ausgebildet ist, daß es eine Länge aufweist, die einem Drittel bis einer Hälfte derjenigen Länge entspricht, die zum Verankern des Drahtseils (10) mit Hilfe des Verankerungselementes (14) allein ohne das mit einem vergrößerten Kopfabschnitt (12) versehene Drahtseil (10) erforderlich wäre.
2. Verankerung nach Anspruch 1, worin die Kopfbildung durch ein Kalt-Kopfbildungsverfahren durchgeführt wird.
3. Verankerung nach Anspruch 1, worin die Kopfbildung bei einer Temperatur in dem Bereich von 200° bis 900°C durchgeführt wird.
4. Verankerung nach einem vorhergehenden Anspruch, worin das Verankerungselement (14) eine Pressungs-Einspannung aufweist.
5. Verankerung nach Anspruch 4, worin die Pressungs-Einspannung (14) eine Hülse (16) und ein Reibungsvergrößerungselement aufweist.
6. Verankerung nach Anspruch 5, worin das Reibungsvergrößerungselement eine Drahtwicklung (18) enthält.
7. Verankerung nach einem vorhergehenden Anspruch, enthaltend eine Lagerplatte (20) mit einer Vielzahl von Verankerungslöchern mit vergrößerten, benachbart zu ihnen angeordneten Räumen zur Bildung einer durchlöcherten Lagerplatte, wobei jeder vergrößerte Raum der Verankerungslöcher zur Aufnahme eines jeweiligen Drahtseils mit einem vergrößerten Kopfabschnitt und einem Verankerungselement ausgebildet ist.
8. Verankerung nach einem der Ansprüche 1 bis 6, worin das Verankerungselement derart ausgebildet ist, daß es eine spitz zulaufende äußere Umfangsoberfläche mit einem Winkel von 5° bis 15° aufweist und von einem entsprechenden vergrößerten Raum mit einer spitz zulaufenden inneren Oberfläche benachbart zu einem Verankerungsloch einer Lagerplatte aufgenommen wird.
9. Verankerung nach Anspruch 8, worin eine Lagerplatte eine Vielzahl der Verankerungslöcher mit vergrößerten, spitz zulaufende innere Oberflächen aufweisenden Räumen zur Bildung einer durchlöcherten Lagerplatte aufweist und jeder vergrößerte Raum zur Aufnahme eines entsprechenden Drahtseils mit einem vergrößerten Kopfabschnitt und einem Verankerungselement ausgebildet ist.
EP83302480A 1983-05-03 1983-05-03 Verankerung für ein Drahtseil Expired EP0124661B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8383302480T DE3365261D1 (en) 1983-05-03 1983-05-03 An anchorage for a wire strand
EP83302480A EP0124661B1 (de) 1983-05-03 1983-05-03 Verankerung für ein Drahtseil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83302480A EP0124661B1 (de) 1983-05-03 1983-05-03 Verankerung für ein Drahtseil

Publications (2)

Publication Number Publication Date
EP0124661A1 EP0124661A1 (de) 1984-11-14
EP0124661B1 true EP0124661B1 (de) 1986-08-13

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ID=8191140

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83302480A Expired EP0124661B1 (de) 1983-05-03 1983-05-03 Verankerung für ein Drahtseil

Country Status (2)

Country Link
EP (1) EP0124661B1 (de)
DE (1) DE3365261D1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640549A1 (de) * 1986-11-27 1988-06-01 Strabag Bau Ag Endverankerung fuer ein spannglied
EP3336258B1 (de) * 2016-12-16 2022-03-09 Stahlton AG Endverankerung für einen boden- und/oder felsanker
CN115653206A (zh) * 2022-12-22 2023-01-31 太原轨道交通集团有限公司 一种预应力碳纤维筋材内锥型锚具及其组装方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH393691A (de) * 1962-03-20 1965-06-15 Brandestini Antonio Verankerung für dynamisch beanspruchten Stahldraht
JPS5130373B1 (de) * 1970-12-03 1976-08-31
CH586814A5 (de) * 1975-02-07 1977-04-15 Bureau Bbr Ltd

Also Published As

Publication number Publication date
EP0124661A1 (de) 1984-11-14
DE3365261D1 (en) 1986-09-18

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